Required. Specifies the path, relative to Cluster, of the field to update. For example, to change the number of workers in a cluster to 5, the updateMask parameter would be specified as config.worker_config.num_instances, and the PATCH request body would specify the new value, as follows:

{
"config":{
"workerConfig":{
"numInstances":"5"
}
}
}

Similarly, to change the number of preemptible workers in a cluster to 5, the updateMask parameter would be config.secondary_worker_config.num_instances, and the PATCH request body would be set as follows:

Optional. A unique id used to identify the request. If the server receives two UpdateClusterRequest requests with the same id, then the second request will be ignored and the first google.longrunning.Operation created and stored in the backend is returned.